13-26

Tsuda, M*, M. Nagao, T. Hirayama, and T. Sugimura* 1981* Nitrite con-
converts 2-amino-a~carbolineS) an indirect mutagen, into 2-hydroxy-a-
carboline, a non-mutagen, and 2~hydroxy-3~nitroso-a-carboline, a direct
mutagen. Mutat. Res. 83:61-68*

Umezawa, K*, A. Shirai, T. Matsushima, and T. Sugimura* 1978. Comu-
tagenic effect of norharman and barman with 2-acetylaminofluorene
derivatives* Proc. Natl. Acad. Sci. U.S.A. 75:928-930*

Uyeta, M., To Kanada, M* Mazaki, S. Taue, and S. Takahashi. 1979.
Assaying mutagenicity of food pyrolysis products using the Ames
test. Pp. 169-176 in E. C. Miller, J. A. Miller, I. Hirono, T.
Sugimura, and S* Takayama, eds. Naturally Occurring Carcinogens-
Mutagens and Modulators of Carcinogenesis. Japan Scientific Societies
Press, Tokyo; University Park Press, Baltimore, Md-

Uyeta, M., S. Taue, and M. Mazaki. 1981. Mutagenicity of hydrolysates
of tea infusions. Mutat. Res. 88:233-240.

Vithayathil, A. J., B. Commoner, S. Nair, and P. Madyastha. 1978. Isola-
tion of mutagens from bacterial nutrients containing beef extract. J*
Toxicol. Environ. Health 4:189-202.

Wakabayashi, K., K. Tsuji, T. Kosuge, K. Takeda, K. Yamaguchi, K. Shudo,
Y. litaka, T. Okamoto, T. Yahagi, M. Nagao, and T. Sugimura. 1978.
Isolation and structure determination of a mutagenic substance in
L-lysine pyrolysate. Proc. Jpn. Acad. 54(B) :569-571.

Wakabayashi, K., M. Nagao, T. Kawachi, and T. Sugimura. 1981. Co-muta-
genic effect of norharman with N-nitrosamine derivatives. Mutat. Res.
80:1-7.

Watson, W. A- F. 1982. The mutagenic activity of quercetin and kaempferol
in Drosophila melanogaster. Mutat. Res. 103:145-147.

Weisburger, J. H., and N. E. Spingarn. 1979. Mutagens as a function of
mode of cooking of meats. Pp. 177-184 in E. C. Miller, J. A. Miller,
I. Hirono, T. Sugimura, and S. Takayama, eds. Naturally Occurring
Carcinogens-Mutagens and Modulators of Carcinogenesis. Japan Scien-
tific Societies Press, Tokyo; University Park Press, Baltimore, Md.

Yamaguchi, K., H. Zenda, K. Shudo, T. Kosuge, T. Okamoto, and T. Sugimura.
1979. Presence of 2-aminodipyrido[l,2-a :3T ,2'~cl]imidazole in casein
pyrolysate. Gann 70:849-850.

Yamaguchi, K., K. Shudo, T. Okamoto, T. Sugimura, and T. Kosuge* 1980a>
Presence of 3-amino-l,4-dimethyl-5H-pyrido[4,3Hb]indole in
beef. Gann 71:745-746.